I'm getting a new tank soon and was thinking of a few I've kept P's on and off for 15 years or so but never piraya,I've read they freak out and go on killing spree's is this common or just over exaggerated? I know all P's can be unpredictable I just don't want to drop a bunch of cash and end up with an empty tank.Some in put from some piraya owners would be appriecated. THANK YOU P's RULE 
